Process for the production of precipitated sulphur



Patented Nov.29,1938 2,138,214 UNITED STATES PATENT OFFlCE PROCESS FOR THE PRODUCTION or PBECIPI ATED SULPHUR William H; Shiffler and Philip Si'Danncr, Berkeley, CaliL, assignors to Standard'Oil Company of California, San Francisco, Calif., a corporation of Delaware 7 I No Drawing. Application July 8, 1935,

Serial No. 30,352

1 Claim. .(Cl. eg -2 24) This invention relates to a process for the proflotation sulphur independently of any other proci precipitated or so-called flotation ess or product.

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u phur a d mor ticularly to a process for In our second above-mentioned copending apump sulphur into flotation sulphur plication we have disclosed the equilibrium consuitable for parasiticidal stant The value oi elementary sulphur in controlling fiy various iung rowt in e i stations =E nd agricultural crops as long een i m (S) (H25) recognize S lph r in o i 5 fi su or ereac 1on4 j division, ground and sublimed, has been available 7 v fi 5 this e. ther such my is, however,

Suited to u Service 3 hence a Search We have now found that this general reaction n better product hasbeen 'des read. lhis may advantageously b app ed 0 h conversion 9 n 1 rch has revealed that sulphur precipitated of any available commercial form of elementary from aqueous luti of appropriate sulphur sulphur into precipitated or flotation sulphur for compounds is, generally superior in every respect Parasiticidal 0 he 5a 6 o e onomy dthe'calci ds to sulph ther of th previous employe have i 0 0f he ions involved h (1 ti thoug obviously any hur in this newer and more satisfactory met 5 which the i Ptaslllphi ml e hydro recovered as a, by-product, of t n sulphide are even moderately soluble in water or g been available 111 certain would er 8 ew w 1 mm o localities as a of y in- L 1 ur is re taken 1 calcium vestigated to p ras t Old. e difficult es bydrosulpmde olut on t lightly el vat tern encoun e ttem ing the conl r f t e siderable quantity of impurities usually associated iormaiilon 0 calculi polylllphides and h with th pr h m liberation drogen sulphide g en the adoption for such use even in localities where it Polysulphide 501111510 50 mm 0166, TOY 15 reg y avail-a, i stance o 6 0 F., then intimately con av p d and used tacted with'hydrogen sulphide the gas is rapidly a small scale to produ e flotation sulphur as absorbed with the pregp'ltauon of elementary so unsatisfactory and o omical s to pre V9 fl tatlon 5 P T of mgh elude wide 1 1 bvio ly h droge ulphlde liberated in In an a lie tion, S 0. 30,353 copending the ioregol g is c meted Store 5 here hw 8 1 and a p 00655 may be m loy d th seeon ste d hence lhere iti possible top oduoe tantially pure the W e 0 a 71th t Y the hydrogen W 911 d impure 1 but con transformation ilump ph of any nvenien taming gas rticularly i m th gases as 129 and shape n a P1 flotimon 500mm 0 d o 01 u 1 sulphur whic dmiraby s d for applica 40 second riding ppli ti r 0. 30,354, ember e on a 4 have disclosed a d m al g o p chemi Y P f m p we con 01 Work cal reactions wh ossi produce Th1 ormatlon T Presented chem a y of sever ul hu contain n aterials from loan}! by the followmg 1e addmon pure hydrog s phi n no s 0 at 180 o development a highly satisfactory precipitated or 1 Ca(1-1S) +4S(lump)/' CaS +H S flotation sulphur is producgd. An extension Pand 69 F adaptation oi the ideas an reactions involv in these two applications constitutes the subject of Ca gi ig sgf this invention. p p p It is the o ct of the present invention to pro- As compared to the hitherto employed method vioe an unlimited supply oi flotation sulphur oi or gr nding r su l m e ump p u for the p satisiactory purity for parasiticidal use. duction of a useful parasiticide our simple solu- It is a further object oi the invention to provide tion and reprecipitation method possesses many iiota' n ul r s st ti ly vvi hou obvious dvaritage It is conside bly cheaper regard to the location source 0 th raw ma results 1 r0 11 which is inh ren ly bette terial hi h it produ adapted the inten e an in certai It 15 a st ll i her ob th invention to instances wor e incidental pllllfhh provide a rocess hereby ordinary leme-ntary tion malnn ossible utilizat a low sulphu d a a d l distribu ed may grade i natu s p thereby m terially r w described a nov art sev ficient proc ss for convertin t s o ers are av ilabl or removing the of bulk m lph r precipitated phu fro the suspe on ro divided, fiet 151011 r 01 need in th second ep befor th solution is asl'ticld other u and returned to first step A er of the con 685 which 1? the s m me 20 tinuous type W1 in 0st inst es b desirable llfion, Wh t We mm 1' though 1n 0th ases Where e necessary A Process for nu s y 0 Wash th traces of hydrosul hi solution same cycle of 1 1 1 8 111) from the sul h a suitable f int rmittent P rity and fine subd sion ada operation m y be preferable. as a d S 01 aqueo pension t 251 hen pure ogen sulphide is availa e from OPS a d lime slflph a D a source othe th that J t scrib as for lcult a1 use, said cycl in ance from process of our first above men of react! calei hydl S D l tioned applicati it ay esirabl 0 pro 111ml) Sulphur 11d r duce a certain amoun of c pentasulphide ture of 11 Sta tlal y 1; 0:1'11 th e c cIe of reach in WhlCh pre a Portion e llp ld 1 cipitated ulph r1 prod d. In uch case and 0 eactm the lema 6 Reaction I given ab v could b modifi as r01 sulphld at a temperature of 0W5: v by elementary sulph precipi 36 III. Ca(HS)2+Ca(OH)z+8S(1ump) g2 g -E M 2CaS5+2HzO Half of the Cass produced w from the cycle for sal ould be withdrawn e or other use and the H28 

